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Georg Raffelt, Max-Planck-Institut für Physik, München, Germany<br />
From Standard to Invisible <strong>Axion</strong>s<br />
PONT d‘Avignon, 21-25 April 2008, Avignon, France<br />
Standard Model<br />
All Higgs degrees of<br />
freedom are used up<br />
Standard <strong>Axion</strong><br />
Weinberg 1978, Wilczek 1978<br />
• Peccei-Quinn scale f a =<br />
electroweak scale f ew<br />
• Two Higgs fields,<br />
separately giving mass<br />
to up-type quarks and<br />
down-type quarks<br />
Invisible <strong>Axion</strong><br />
Kim 1979, Shifman,<br />
Vainshtein, Zakharov 1980,<br />
Dine, Fischler, Srednicki 1981<br />
Zhitnitsky 1980<br />
• Additional Higgs with<br />
f a ≫ f ew<br />
• <strong>Axion</strong>s very light and<br />
and very weakly<br />
interacting<br />
No room for axions<br />
<strong>Axion</strong>s quickly ruled out<br />
experimentally and<br />
astrophysically<br />
• New scale required<br />
• <strong>Axion</strong>s can be<br />
cold dark matter<br />
• Can be detected
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